Delevingne, DeHaan, stars of big-budget sci-fi "Valerian" With its $180 million budget, two relatively new stars and obscure source material, Luc Besson is betting the house on the success of "Valerian and the City of a Thousand Planets." Dane DeHaan and Cara Delevingne spent six months in Paris filming the sci-fi feature, which comes out in US cinemas on Friday. IMAGES AND SOUNDBITES